A perturbation theory scheme in terms of electron hopping, which is based on the Wick
theorem for Hubbard operators, is developed. Diagrammatic series contain single-site …

A general scheme to calculate dynamical susceptibilities of strongly correlated electron
systems within the dynamical mean field theory is developed. The approach is based on an …

An approximate analytical scheme of the dynamical mean-field theory (DMFT), that is used
for electron systems with Hubbard correlations and is exact in the limit of the infinite …

A general scheme to calculate dynamical susceptibilities of strongly correlated electron
systems within the dynamical mean field theory is developed. Approach is based on an …

Thermodynamics of a pseudospin-electron model without correlations is investigated. The
correlation functions, the mean values of pseudospin and particle number, as well as the …

Self-consistent approach for the thermodynamics of a simplified pseudospin-electron model
Page 132 Page 1 IV STASYUK, AM SHVAIKA, KV TABUNgHOHYK са> эооо SELF-CONSISTENT …

The mean field type approach based on the self-consistent consideration of an effective field
created by electron transfer is developed for a description of thermodynamics of the …

The static and dynamic dielectric susceptibility of the pseudospin-electron model is
investigated in the random phase approximation. The possibility of the phase transition to …

We derive an alternative representation for the $ f $-electron spectral function of the Falicov-
Kimball model from the original one proposed by Brandt and Urbanek. In the new …

Some aspects of physical phenomena in high-Tc crystals caused by anharmonicity of the
crystal lattice are discussed. Appropriate theoretical models are considered. A review is …